This is a mini LED digital thermometer. It is designed to allow you to monitor the outside temperature and the red LED readout makes it easy to read. This meter measures 1 1⁄4" X 7/8" X 1" deep, is lightweight, waterproof and comes with a mounting clip which allows it to be mounted on any flat surface. It reads from -20 to +140 degrees Fahrenheit, is easy to connect and will work on any 12V system. This is notswitchable to Celsius. The power lead wire that comes with this is 36" long however, the sending unit wire is only 2" long. Note: If you need the sending unit to be more than 2" from the display unit, you will need to cut the wire and splice in extensions. 45-1407